hi

I have had my computer for around 2 years now i think and its recently develpoed a problem where when i turn it on everything works fine for a bit (ranging from 2 hours to under a minute) then my computer screen will just turn black and the little orange light will come on in place of the green one, then the computer will make a few whirring noises but continue to run, all the lights and fans in the computer are still running and the power button is still lit up green. Its very much like when the screen would turn off and you would have to move the mouse/type on keyoard to wake it up

Also my keyboard and mouse become unresponsive and al the lights on the wireless reciever turn off.

Its an XPS 400.

Please help !

thanks

(Sorry if this is in the wrong place, i couldnt find a more relevant one)